The "scale" caused by hard water is _ .

Question

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The term "scale" is commonly used to describe the buildup of mineral deposits on surfaces that come into contact with hard water. Hard water contains high levels of dissolved minerals, most commonly calcium and magnesium ions. When hard water evaporates or is heated, these minerals can precipitate out of solution and form a thin layer of scale on surfaces, such as pipes, appliances, and fixtures. The primary mineral in this scale buildup is calcium carbonate.

The "Scale" Caused by Hard Water Is _